rd

Distinguishes a route for Virtual Routing and Forwarding (VRF) instances.
Syntax
rd {ASN : nn | IP-address : nn }
Parameters
ASN:nn
Configures the RD as autonomous system number followed by a colon (:) and a unique arbitrary number.
IP-address:nn
Configures the RD as IP address followed by a colon (:) and a unique arbitrary number.
Modes

VRF configuration mode

Usage Guidelines

Each VRF instance is identified by a unique route distinguisher (RD). The RD is prepended to the address being advertised. Because the RD provides overlapping client address space with a unique identifier, the same IP address can be used in different VRFs without conflict. The RD can be an autonomous system number, followed by a colon (:) and a unique arbitrary number as in "10:11". Alternatively, it canbe a local IP address followed by a colon (:) and a unique arbitrary number, as in "1.1.1.1:100".

Once the Route Distinguisher is configured for a VRF it cannot be changed or deleted. To remove the route distinguisher, you must delete the VRF.

Examples

The following example configures a Route Distinguisher. 

device(config)# vrf red
sevice(config-vrf-red)# rd 101:101
Parent topic: Commands O, P, Q, R, and Sa through Sh